Principles of Microeconomics: Formula Sheet

Principles of Microeconomics: Formula Sheet

Build a responsible reference sheet of relationships, conditions, units, representations, and decision rules rather than copying unexplained formulas. Studies choices, markets, elasticity, welfare, market structures, externalities, and policy. Course titles, local sequences, grading, safety rules, required tools, and assessment formats vary; align this resource with the current syllabus and instructor directions.

Learning outcomes

• Explain and apply opportunity cost, then connect it to supply and demand using course-appropriate evidence.
• Explain and apply supply and demand, then connect it to elasticity using course-appropriate evidence.
• Explain and apply elasticity, then connect it to market structures using course-appropriate evidence.
• Explain and apply market structures, then connect it to externalities and public policy using course-appropriate evidence.
• Explain and apply externalities and public policy, then connect it to opportunity cost using course-appropriate evidence.

Prerequisite readiness

algebra, graphs, percentages, and careful distinction between positive and normative claims Use a short ungraded check, repair the smallest missing skill, and immediately retest it in a course-level task.

Reference-sheet entries

• opportunity cost: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• supply and demand: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• elasticity: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• market structures: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• externalities and public policy: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.

Use test

Can you choose the right relationship on an unlabeled task and explain why its conditions hold? If not, the sheet is storage rather than understanding.

Reliable method

define agents and incentives, draw or state the model, shift one determinant at a time, solve, and compare efficiency and equity Keep assumptions, intermediate reasoning, units, sources, tool use, and checks visible so another learner can follow the decision process.

Representative application

Analyze a tax using supply and demand, elasticity, incidence, revenue, and limits of the model. Predict a reasonable result before working, compare the outcome with the prediction, and explain limitations or alternative interpretations.

Error recovery

Watch for moving along a curve when a determinant shifts the curve or treating efficiency as the same as fairness. Mark the first unsupported move, classify the cause, correct the reasoning, and schedule a fresh mixed recheck after a delay.

Accessibility, integrity, and safety

Use approved accommodations and accessible formats. Follow course rules for collaboration, citation, calculators, software, generative tools, laboratories, clinical settings, field activity, privacy, copyright, and human or animal subjects. Never use Exams.fit to obtain protected questions or bypass assessment rules.

Evidence to save

When permitted, preserve an economic model with graph, calculation, behavioral explanation, policy trade-offs, and limitations with the prompt, first attempt, feedback, revision, verification, and reflection. Remove restricted assessment content and private or proprietary information.

Open-learning reference

Compare this original Exams.fit resource with the relevant OpenStax collection and MIT OpenCourseWare when they match the local course. Reviewed August 2, 2026. This page does not replace the current syllabus, instructor, institution, or qualified professional.